var isDone = true;
// 使用构造函数Boolean创造的对象不是布尔值
// let createByBoolean:boolean = new Boolean(1)
var createByBoolean = Boolean(1);
// 数值类型
var num = 6;
var notanumber = NaN;
var infinityNumber = Infinity;
// 字符串
var myName = '薄荷er';
var content = "\u6211\u662F".concat(myName);
var add = function (a, b) { return a + b; };
// 空值,如果返回值是控制的话，void
function sayName(name) {
    console.log(name);
}
var value;
value = null;
value = undefined;
var u = undefined;
var n = null;
n = undefined;
u = null;
